Secluded amid upstate New York’s Adirondack Mountains lies this subterranean emblem of a nation on the brink of nuclear war. And it's for sale.

In the fictional world of Kcymaerxthaere, celestial wonders marked a portal to a powerful route of travel at this site in Madrid, Spain.

A place of great reverence for Trekkies everywhere, a hero's future birthplace.

San Francisco's newly reopened hands-on science museum.

The only surviving prototype for Buckminster Fuller's house of the future.

The birthplace of the very first human resident born in Antarctica.

One of only two civilian settlements in the desolate lands of chilly Antarctica.

One of Hollywood’s favorite government buildings.

A natural gas leak provides a flickering flame beneath a waterfall.

For those with no fear of heights: a skywalk 4,700 feet up on a Chinese mountain.

Terrapins of all colors and shapes are quick to bring fascination (and possibly long life) at this museum.

An out-of-place slice of France, smack in the middle of Shanghai.

Home to Hollywood history and a very special salt crystal.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

A glacier pocked with ice caves and surrounded by rainforests.

Public outcry led to this bridge's unique character which celebrates a giant frog battle and also sewing.

This former stomping grounds of the most eminent astronomers of the early 20th century.

This natural Icelandic fissure allows divers to swim right between two volatile tectonic plates.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

The largest arcade museum in the world chronicles the golden age of video games which ended promptly in 1987.